diff --git a/test/server/utils/scandir.test.js b/test/server/utils/scandir.test.js
new file mode 100644
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--- /dev/null
+++ b/test/server/utils/scandir.test.js
@@ -0,0 +1,52 @@
+const Path = require('path')
+const chai = require('chai')
+const expect = chai.expect
+const scanUtils = require('../../../server/utils/scandir')
+
+describe('scanUtils', async () => {
+  it('should properly group files into potential book library items', async () => {
+    global.isWin = process.platform === 'win32'
+    global.ServerSettings = {
+      scannerParseSubtitle: true
+    }
+
+    const filePaths = [
+      'randomfile.txt', // Should be ignored because it's not a book media file
+      'Book1.m4b', // Root single file audiobook
+      'Book2/audiofile.m4b',
+      'Book2/disk 001/audiofile.m4b',
+      'Book2/disk 002/audiofile.m4b',
+      'Author/Book3/audiofile.mp3',
+      'Author/Book3/Disc 1/audiofile.mp3',
+      'Author/Book3/Disc 2/audiofile.mp3',
+      'Author/Series/Book4/cover.jpg',
+      'Author/Series/Book4/CD1/audiofile.mp3',
+      'Author/Series/Book4/CD2/audiofile.mp3',
+      'Author/Series2/Book5/deeply/nested/cd 01/audiofile.mp3',
+      'Author/Series2/Book5/deeply/nested/cd 02/audiofile.mp3',
+      'Author/Series2/Book5/randomfile.js' // Should be ignored because it's not a book media file
+    ]
+
+    // Create fileItems to match the format of fileUtils.recurseFiles
+    const fileItems = []
+    for (const filePath of filePaths) {
+      const dirname = Path.dirname(filePath)
+      fileItems.push({
+        name: Path.basename(filePath),
+        reldirpath: dirname === '.' ? '' : dirname,
+        extension: Path.extname(filePath),
+        deep: filePath.split('/').length - 1
+      })
+    }
+
+    const libraryItemGrouping = scanUtils.groupFileItemsIntoLibraryItemDirs('book', fileItems, false)
+
+    expect(libraryItemGrouping).to.deep.equal({
+      'Book1.m4b': 'Book1.m4b',
+      Book2: ['audiofile.m4b', 'disk 001/audiofile.m4b', 'disk 002/audiofile.m4b'],
+      'Author/Book3': ['audiofile.mp3', 'Disc 1/audiofile.mp3', 'Disc 2/audiofile.mp3'],
+      'Author/Series/Book4': ['CD1/audiofile.mp3', 'CD2/audiofile.mp3', 'cover.jpg'],
+      'Author/Series2/Book5/deeply/nested': ['cd 01/audiofile.mp3', 'cd 02/audiofile.mp3']
+    })
+  })
+})